Handlebar extension



FIG. 1 is a perspective view as seen from the front and upper left of a handlebar extension showing my new design with attachment elements shown in broken lines;

FIG. 2 is a perspective view as seen from the front and upper left thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof, the right side is a mirror image;

FIG. 6 is a top plan view thereof, the bottom is a mirror image; and,

FIG. 7 is a top plan view of a second embodiment thereof, the bottom is a mirror image the front and rear elevational views are identical to those shown in FIGS. 3 and 4, the left side elevational view is subtantially identical to that shown in FIG. 5 with a concave front surface, and the right side is a mirror image of the left side.

The broken line illustration is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a handlebar extension, as shown and described. 